diff options
Diffstat (limited to 'storage/innobase/include/data0data.ic')
| -rw-r--r-- | storage/innobase/include/data0data.ic | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/storage/innobase/include/data0data.ic b/storage/innobase/include/data0data.ic index 2e3adf4b707..5c0f8039c80 100644 --- a/storage/innobase/include/data0data.ic +++ b/storage/innobase/include/data0data.ic @@ -229,20 +229,30 @@ dfield_dup( } /*********************************************************************//** -Tests if data length and content is equal for two dfields. -@return TRUE if equal */ +Tests if two data fields are equal. +If len==0, tests the data length and content for equality. +If len>0, tests the first len bytes of the content for equality. +@return TRUE if both fields are NULL or if they are equal */ UNIV_INLINE ibool dfield_datas_are_binary_equal( /*==========================*/ const dfield_t* field1, /*!< in: field */ - const dfield_t* field2) /*!< in: field */ + const dfield_t* field2, /*!< in: field */ + ulint len) /*!< in: maximum prefix to compare, + or 0 to compare the whole field length */ { - ulint len; + ulint len2 = len; - len = field1->len; + if (field1->len == UNIV_SQL_NULL || len == 0 || field1->len < len) { + len = field1->len; + } + + if (field2->len == UNIV_SQL_NULL || len2 == 0 || field2->len < len2) { + len2 = field2->len; + } - return(len == field2->len + return(len == len2 && (len == UNIV_SQL_NULL || !memcmp(field1->data, field2->data, len))); } |